Commit | Line | Data |
---|---|---|
b13d93c2 PW |
1 | /* |
2 | * Copyright (C) 2013 Paul Woegerer <paul.woegerer@mentor.com> | |
8e2aed3f | 3 | * Copyright (C) 2015 Antoine Busque <abusque@efficios.com> |
b13d93c2 PW |
4 | * |
5 | * This library is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU Lesser General Public | |
7 | * License as published by the Free Software Foundation; version 2.1 of | |
8 | * the License. | |
9 | * | |
10 | * This library is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * Lesser General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU Lesser General Public | |
16 | * License along with this library; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
19 | ||
5aed31fc | 20 | #define _LGPL_SOURCE |
b13d93c2 | 21 | #define _GNU_SOURCE |
8e2aed3f | 22 | |
13436238 | 23 | #include <limits.h> |
8e2aed3f | 24 | #include <stdio.h> |
13436238 | 25 | #include <sys/types.h> |
8e2aed3f AB |
26 | #include <unistd.h> |
27 | ||
28 | #include <lttng/ust-dlfcn.h> | |
29 | #include <lttng/ust-elf.h> | |
eb2b066f | 30 | #include "usterr-signal-safe.h" |
b13d93c2 | 31 | |
8e2aed3f AB |
32 | /* Include link.h last else it conflicts with ust-dlfcn. */ |
33 | #include <link.h> | |
b13d93c2 | 34 | |
13436238 | 35 | #define TRACEPOINT_DEFINE |
6d4658aa | 36 | #include "ust_dl.h" |
13436238 | 37 | |
b13d93c2 PW |
38 | static void *(*__lttng_ust_plibc_dlopen)(const char *filename, int flag); |
39 | static int (*__lttng_ust_plibc_dlclose)(void *handle); | |
b13d93c2 PW |
40 | |
41 | static | |
42 | void *_lttng_ust_dl_libc_dlopen(const char *filename, int flag) | |
43 | { | |
44 | if (!__lttng_ust_plibc_dlopen) { | |
45 | __lttng_ust_plibc_dlopen = dlsym(RTLD_NEXT, "dlopen"); | |
8e2aed3f | 46 | if (!__lttng_ust_plibc_dlopen) { |
b13d93c2 PW |
47 | fprintf(stderr, "%s\n", dlerror()); |
48 | return NULL; | |
49 | } | |
50 | } | |
51 | return __lttng_ust_plibc_dlopen(filename, flag); | |
52 | } | |
53 | ||
54 | static | |
55 | int _lttng_ust_dl_libc_dlclose(void *handle) | |
56 | { | |
57 | if (!__lttng_ust_plibc_dlclose) { | |
58 | __lttng_ust_plibc_dlclose = dlsym(RTLD_NEXT, "dlclose"); | |
8e2aed3f | 59 | if (!__lttng_ust_plibc_dlclose) { |
b13d93c2 PW |
60 | fprintf(stderr, "%s\n", dlerror()); |
61 | return -1; | |
62 | } | |
63 | } | |
64 | return __lttng_ust_plibc_dlclose(handle); | |
65 | } | |
66 | ||
67 | static | |
03db42de | 68 | void lttng_ust_dl_dlopen(void *so_base, const char *so_name, void *ip) |
b13d93c2 | 69 | { |
13436238 | 70 | char resolved_path[PATH_MAX]; |
8e2aed3f AB |
71 | struct lttng_ust_elf *elf; |
72 | uint64_t memsz; | |
83215d66 | 73 | uint8_t *build_id = NULL; |
8e2aed3f | 74 | size_t build_id_len; |
83215d66 | 75 | char *dbg_file = NULL; |
8e2aed3f AB |
76 | uint32_t crc; |
77 | int has_build_id = 0, has_debug_link = 0; | |
78 | int ret; | |
b13d93c2 | 79 | |
13436238 PW |
80 | if (!realpath(so_name, resolved_path)) { |
81 | ERR("could not resolve path '%s'", so_name); | |
82 | return; | |
b13d93c2 | 83 | } |
b13d93c2 | 84 | |
8e2aed3f AB |
85 | elf = lttng_ust_elf_create(resolved_path); |
86 | if (!elf) { | |
87 | ERR("could not acces file %s", resolved_path); | |
13436238 | 88 | return; |
b13d93c2 | 89 | } |
13436238 | 90 | |
8e2aed3f AB |
91 | ret = lttng_ust_elf_get_memsz(elf, &memsz); |
92 | if (ret) { | |
93 | goto end; | |
94 | } | |
95 | ret = lttng_ust_elf_get_build_id( | |
96 | elf, &build_id, &build_id_len, &has_build_id); | |
97 | if (ret) { | |
98 | goto end; | |
99 | } | |
100 | ret = lttng_ust_elf_get_debug_link( | |
101 | elf, &dbg_file, &crc, &has_debug_link); | |
102 | if (ret) { | |
103 | goto end; | |
104 | } | |
105 | ||
6d4658aa | 106 | tracepoint(lttng_ust_dl, dlopen, |
8e2aed3f AB |
107 | ip, so_base, resolved_path, memsz); |
108 | ||
109 | if (has_build_id) { | |
110 | tracepoint(lttng_ust_dl, build_id, | |
111 | ip, so_base, build_id, build_id_len); | |
8e2aed3f AB |
112 | } |
113 | ||
114 | if (has_debug_link) { | |
115 | tracepoint(lttng_ust_dl, debug_link, | |
116 | ip, so_base, dbg_file, crc); | |
8e2aed3f AB |
117 | } |
118 | ||
119 | end: | |
83215d66 MD |
120 | free(dbg_file); |
121 | free(build_id); | |
8e2aed3f | 122 | lttng_ust_elf_destroy(elf); |
13436238 | 123 | return; |
b13d93c2 PW |
124 | } |
125 | ||
126 | void *dlopen(const char *filename, int flag) | |
127 | { | |
8e2aed3f AB |
128 | void *handle; |
129 | ||
130 | handle = _lttng_ust_dl_libc_dlopen(filename, flag); | |
bd703713 | 131 | if (__tracepoint_ptrs_registered && handle) { |
b13d93c2 | 132 | struct link_map *p = NULL; |
8e2aed3f AB |
133 | int ret; |
134 | ||
135 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
136 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
03db42de MD |
137 | lttng_ust_dl_dlopen((void *) p->l_addr, p->l_name, |
138 | __builtin_return_address(0)); | |
8e2aed3f | 139 | } |
b13d93c2 | 140 | } |
8e2aed3f | 141 | |
b13d93c2 PW |
142 | return handle; |
143 | } | |
144 | ||
145 | int dlclose(void *handle) | |
146 | { | |
e7953e6e | 147 | if (__tracepoint_ptrs_registered) { |
b13d93c2 | 148 | struct link_map *p = NULL; |
8e2aed3f AB |
149 | int ret; |
150 | ||
151 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
152 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
153 | tracepoint(lttng_ust_dl, dlclose, | |
154 | __builtin_return_address(0), | |
155 | (void *) p->l_addr); | |
156 | } | |
b13d93c2 | 157 | } |
8e2aed3f | 158 | |
b13d93c2 PW |
159 | return _lttng_ust_dl_libc_dlclose(handle); |
160 | } |